I have several old map/propane tanks. Some of them have a little rust on the threads/seats. They're 1/2 full but I'm concerned about adequate sealing. Is there a way to clean these off safely or should I get rid of them somehow?
Yep, brass or monel as neither spark.My first guess would be use a small brass, not steel, wire brush. (Hand brush, not powered). But research some more before trying this!